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Q.

Which of the elements possess only one electron in 5d orbital?

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a

 69Tm.61Pm 

b

59Pr.71Lu
 

c

 57La.61Pm 

d

 57La.71Lu

answer is D.

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Detailed Solution

57La=[54Xe]5d16s2
 71Lu=[54Xe]4f145d16s2

69Tm =[54Xe]4f13 6s2

61Pm =[54Xe]4f56s2

59Pr =[54Xe]4f36s2

 

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